str1="wo"
str2="hao"
str3="nihao"
print(str1)
print(str2)
print(str3)
print("he\'llo,world")
print('123---{0}---{1}---{2}'.format(4,5,6))
print(f"{str3}100-i")
print(3//2)
for i in range(0,101,2):
    print("======正在下载======")
    if i == 100:
        print("下载完成")
    else:
        str4 = "*"*(i//2)+"."*((100-i)//2)
        print(f'{i}%[{str4}]')